Update mojo sdk to rev afb4440fd5a10cba980878c326180b7ad7960480

mojo/edk/system/channel_info.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/channel_info.h"
 
+#include <algorithm>
+
 namespace mojo {
 namespace system {
 
 ChannelInfo::ChannelInfo() {
 }
 
 ChannelInfo::ChannelInfo(
     scoped_refptr<Channel> channel,
     scoped_refptr<base::TaskRunner> channel_thread_task_runner)
     : channel(channel), channel_thread_task_runner(channel_thread_task_runner) {
 }
 
 ChannelInfo::~ChannelInfo() {
 }
 
+void ChannelInfo::Swap(ChannelInfo* other) {
+  // Note: Swapping avoids refcount churn.
+  std::swap(channel, other->channel);
+  std::swap(channel_thread_task_runner, other->channel_thread_task_runner);
+}
+
 }  // namespace system
 }  // namespace mojo